US2561897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary contact modulator circuit
Assignee: Individual
•
Filing: 1945-11-29
•
Granted: 1951-07-24
•
Expires: 1965-11-29
Abstract
No abstract record available.
Inventors
- 👤 Harry J White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:33
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/28; G01S7/282; H; H02; H02M; H02M5/00; H02M5/02; H02M5/32; H03; H03K; H03K3/00; H03K3/02; H03K3/53
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |